UPDATE:
A couple of days after public posts, threats that I will expose their previous wrongdoings, their use of fake identities and everything else that I have found, and proved them that I do have some info, like names and addresses of their Australian Paypal accounts, that I will report them to every hosting, domain registrar, etc. they accepted to process my exchange after answering a few questions, without KYC, but to keep 10% as fee because transaction is high risk.
So, I got 90% back.
Just to let everyone know, they have at least one more site: imexchanger.pro
I'm finished here.
Thanks for the update!
Honestly, if you do have evidence and info about them that they don't want to be public; since you got those 90% already, why not use that information to get the last 10%? I'm not saying you should do this, but hypothetically, if they don't return the full amount, you could just deliver on those threats. At that point it's their choice, right.
I will also add imexchanger to my blacklist! How did you link that site to openchange?